Tetrahydrocannabinol Definition
 tĕtrə-hīdrə-kə-năbə-nôl, -nōl, -nŏl 
    noun
  
 THC.
 American Heritage Medicine 
The hallucinatory chemical, C21H30O2, that is the principal and most active ingredient in marijuana; THC.
 Webster's New World 
(organic chemistry) The psychoactive substance present in cannabis, a hydrogenated derivative of cannabinol.
Wiktionary 
Synonyms: 
  Origin of Tetrahydrocannabinol
-  
From tetra- +"Ž hydro- +"Ž cannabinol.
From Wiktionary
 
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